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375420HV141 Technical Profile © Application: Long Range Hunting

Barrel Bore Diameter: 0.367" 9.320 mm The diameter of the barrel from land to land.

Barrel Groove Diameter: 0.376" 9.550 mm The diameter of the barrel from groove to groove.

Bullet Weight: 420gr 27.2g Bullets are guaranteed to weigh within 0.25% of the stated weight.

Bullet Length: 2.40" 61.050 mm

Tangent Ogive Length: 1.39" 35.323 mm These dimensions are critical to consistent external ballistic performance and are held constant to within 0.005 mm (0.0002")

Meplat Diameter: 0.11" 2.700 mm

Min Bullet Protrusion: 1.48" 37.690 mm Add the case length to these numbers to determine the maximum and minimum cartridge overall length that is possible with this bullet.

Max Bullet Protrusion: 1.93" 49.000 mm

Bullet does not conform to CIP and SAAMI for magazine length. Check the magazine length of your rifle for suitability with this bullet.

Maximum M/V: 3500fps 1,067 m/s If the maximum muzzle speed is exceeded, dynamic stabilty problems may be encountered.

Short Range Twist: 7.4" / 189 mm or tighter 20.3 Cal/length or tighter Twist recommended if average hunting distances are 340 yards or 320 m. A tighter twist can be used.

Twist: Sg = 1.5: 8.0" / 205 mm 22.0 Cal. in length General hunting twist for average distances to 710 yards or 650 m. A tighter twist can be used.

Minimum Twist: 9" / 228.6 mm 24.5 Calibers in length The twist required for stable flight and good terminal performance further than 710 yds or 650 m.

Minimum Impact Speed: 1600fps 488 m/s At this impact speed, the bullet will open to at least double caliber.

Calculated Ballistic Coefficient - G1 profile

BC = 0.847 3500 fps to 2550 fps 1,067 m/s to 777 m/s BC values are calculated at standard Metro values and serve as a comparison between GSC bullets. Any comparison with the BC values of other manufacturers is not valid as there is currently no standard method in use between manufacturers.

BC = 0.806 2550 fps to 1600 fps 777 m/s to 488 m/s

BC = 0.815 1600 fps to 0 fps 488 m/s to 0 m/s

Suitable Cartridges, with consideration of the above specifications:

.375" Calibers

NOTES

A Gyroscopic Stability (Sg) greater than 1.1 is required for stable flight with HV and HP bullets. For hunting at average 710yds/650m, an Sg of up to 1.5 or more can be used. For longer distances the Sg can be decreased but never less than 1.1.

*Note that Sg increases as twist tightens. *A 1:10" twist is tighter than a 1:12" twist within a given caliber only. *Twist rates given in caliber lengths can be compared across calibers. *Choose a bullet length best suited to your rifle twist and type of shooting. *When a bullet is specified for a given twist rate, it can also be used in any twist that is tighter. Using it in a slower twist than specified, is not advisable. *Some experimentation will be required to determine exact drop tables for your equipment and location.

375420HV141 Technical Profile © Application: Long Range Hunting

Barrel Bore Diameter:	0.367"	9.320 mm	The diameter of the barrel from land to land.
Barrel Groove Diameter:	0.376"	9.550 mm	The diameter of the barrel from groove to groove.
Bullet Weight:	420gr	27.2g	Bullets are guaranteed to weigh within 0.25% of the stated weight.
Bullet Length:	2.40"	61.050 mm
Tangent Ogive Length:	1.39"	35.323 mm	These dimensions are critical to consistent external ballistic performance and are held constant to within 0.005 mm (0.0002")
Meplat Diameter:	0.11"	2.700 mm
Min Bullet Protrusion:	1.48"	37.690 mm	Add the case length to these numbers to determine the maximum and minimum cartridge overall length that is possible with this bullet.
Max Bullet Protrusion:	1.93"	49.000 mm
Bullet does not conform to CIP and SAAMI for magazine length.			Check the magazine length of your rifle for suitability with this bullet.
Maximum M/V:	3500fps	1,067 m/s	If the maximum muzzle speed is exceeded, dynamic stabilty problems may be encountered.
Short Range Twist:	7.4" / 189 mm or tighter	20.3 Cal/length or tighter	Twist recommended if average hunting distances are 340 yards or 320 m. A tighter twist can be used.
Twist: Sg = 1.5:	8.0" / 205 mm	22.0 Cal. in length	General hunting twist for average distances to 710 yards or 650 m. A tighter twist can be used.
Minimum Twist:	9" / 228.6 mm	24.5 Calibers in length	The twist required for stable flight and good terminal performance further than 710 yds or 650 m.
Minimum Impact Speed:	1600fps	488 m/s	At this impact speed, the bullet will open to at least double caliber.
Calculated Ballistic Coefficient - G1 profile
BC = 0.847	3500 fps to 2550 fps	1,067 m/s to 777 m/s	BC values are calculated at standard Metro values and serve as a comparison between GSC bullets. Any comparison with the BC values of other manufacturers is not valid as there is currently no standard method in use between manufacturers.
BC = 0.806	2550 fps to 1600 fps	777 m/s to 488 m/s
BC = 0.815	1600 fps to 0 fps	488 m/s to 0 m/s
Suitable Cartridges, with consideration of the above specifications:

.375" Calibers


NOTES
A Gyroscopic Stability (Sg) greater than 1.1 is required for stable flight with HV and HP bullets. For hunting at average 710yds/650m, an Sg of up to 1.5 or more can be used. For longer distances the Sg can be decreased but never less than 1.1.

Note that Sg increases as twist tightens. A 1:10" twist is tighter than a 1:12" twist within a given caliber only. Twist rates given in caliber lengths can be compared across calibers. Choose a bullet length best suited to your rifle twist and type of shooting. When a bullet is specified for a given twist rate, it can also be used in any twist that is tighter. Using it in a slower twist than specified, is not advisable. Some experimentation will be required to determine exact drop tables for your equipment and location.